Question

Does Kyurem-Black gain STAB from Electric-type moves?

Comments

Actually tho I always kinda assumed it did. Good question.

Answer 1

0 Atk Teravolt Kyurem-Black Fusion Bolt vs. 0 HP / 0 Def Abomasnow: 72-85 (22.4 - 26.4%) -- 22% chance to 4HKO
0 Atk Teravolt [electric ice] Kyurem-Black Fusion Bolt vs. 0 HP / 0 Def Abomasnow: 108-128 (33.6 - 39.8%) -- guaranteed 3HKO

source
Changing Kyurem's type to electric gives it STAB and raises damage, so Kyurem didn't have STAB before.

Comments

But how do you change its type?

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Ctrl f "type" and click the buttons next to where it says "type".

Answer 2

No
It is Ice Dragon type still